Ortho Biotic Women'sOrtho Biotic Womens is a unique probiotic formula designed to maintain a healthy vaginal microflora and support urogenital health. A healthy vaginal environment is mildly acidic, and therefore Lactobacillus species dominate this ecosystem. Ortho Biotic Womens provides two specific species of Lactobacilli: L. reuteri and L. rhamnosus. These two species are backed by human clinical studies to establish a healthy, stable vaginal ecosystem.